When mineral-rich water soaks into a decaying organisiſ, the minerals may gradually fill th
produced in this manner?
a. petrified fossil
b. preserved remains
c. trace fossil
d. cast or mold

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint